<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<p id="time"></p>
<body>
<script>
    var hour=0;
    var min=9;
    var second=0;
    setInterval(function () {
        if(second >=59){
            min+=1;
            second=0;
        }else{
            second+=1;
        }
        if(min >=59){
            hour+=1;
            min=0;
        }
        document.getElementById('time').innerHTML=jude(hour)+':'+jude(min)+':'+jude(second)
    },10)

    function jude(time) {
        if(time>9){
            return time;
        }else{
            return '0'+time;
        }
    }
</script>
</body>
</html>